Browsing by Author "Akingbohungbe, A. E."

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    Artificial Defoliaton of Cowpea [Vigna unguiculata (L.) Walp.] cv. Ife Brown to Simulate Insect Damage: Effects on Crop Performance
    (Faculty of Agriculture, University of Ife, 1980) Akingbohungbe, A. E.
    The effects of defoliation on cowpea, Vigna unguiculata (L.) Walp cv. Ife Brown, were studied in the screenhouse by removing varying proportions of the laminae of leaflet along-the transverse plane, to give varying nominal levels of defoliation. Plants subjected once to 25%, SO%, 75% and 100% defoliation at either the primary leaf stage, the first trifoliate leaf stage or the second trifoliate leaf stage, were not adversely affected with respect to days to peak flowering, number of flowers per plant, number of pods per plant as well as number and weight of seeds per plant. However, 100% defoliation significantly delayed the days to first flower production. When plants were subjected to 25%, 50% and 75% nominal defoliation once a week for a period of three weeks, commencing at the first trifoliate leaf stage, significant treatment effects were observed with the 75% defoliation adversely affecting the number of pods per plant, number and weight of seeds per plant. I t was also observed that defoliated leaflets tended to compensate by increasing their widths. The importance of the results are discussed in relation to the impact of defoliators and recommendation's for their control in cowpea production.
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    A Taxonomic Study of the Acridoidea (Orthoptera) of Southwestern Nigeria.
    (Obafemi Awolowo University, 1987) Nzekwu, Anthony Nwora; Akingbohungbe, A. E.
    The Acridoidea of southwestern Nigeria was studied. Collection of species of Acridoidea was made from different parts of southwestern Nigeria between 1982 and 1986. The collected specimens were identified and a checklist of the species was prepared. Detailed description of each species was carried out. Keys for the separation of these species were prepared based on the external morphological features. The genitalia were examined and four different vies illustrated for each species. Photographs of all the species are presented in this thesis. A total of 58 species were studied belonging to the families’ pyrgomorphidae and Acrididae. Most of the phallic structures were in agreement with previous studies. However, the phallic structures of the sub-family Oedipodinae contrary to the views of some acridologists showed some affinities especially in the epiphallus. Some affinities were also observed in the phallic structures of Coryphosima producta (Walker), C. stenoptera (Schaum), Holoperono gestaeckeri I. Bolivar, Zacompsa festa Karsch, Gymnobothrus flaviventris Urarov and Chrisra compta (Walker). The families Pyrgomorphidae are made up of species that are generally less active than those of Acrididae. The similarities in the habitat preferences and colour patterns or Oxya hyla Serville and Spathostrenum pygmaeum Karsch were not matched by morpholozical affinities.